1. Assistant Professor, Dept. of Engineering Professional Development, Univ. of Wisconsin-Madison, 833 Extension Building, 432 North Lake Street, Madison, WI 53706; formerly, Senior Geotechnical Project Engineer, CH2M HILL, 1717 Arch St., Suite 4400, Philadelphia, PA 19103 (corresponding author).
2. Wisconsin Distinguished Professor, Dept. of Civil and Environmental Engineering, Univ. of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706.